Hi Jane,
As is all to frequent - it's a bit like hitting a moving target...
I don't believe there have been any other changes to the site, but I can't confirm that with anything approaching absolute confidence.
The one thing to be aware of is that links to this site are generated automatically based on the way news articles are tagged on "sister sites". This means that there's a considerable ebb and flow of links pointing to the site.
The development site that was pointing all these links additional links to the target site has now been placed behind some authentication (this happened a week or so ago). Even though some of the links from this site had be rediscovered before that was done - there was no sign of any upswing.
Nothing that I'm aware of has changed, but over the weekend/today we're now seeing a significant improvement in organic traffic (it's too early to talk about a recovery though.) GWT is also started showing a lift in the impressions too. We'll need to see what happens over the next couple of days.
I don't think that the disappearance of the links happened on exactly the same day as the site lost it's traffic. All I can tell is that ahrefs reported the -17k links on the same day. I've not been able to establish when exactly the links were removed. (Important lesson for the web developer here - make sure you keep a decent change-log!)
Following David's tip off, I did a bit of digging around any updates that may have affected things.
Mozcast showed a couple of days of activity on the 17/18th and Rank Ranger had an indication of an update at the same time. Serpmetrics etc also had similar indications.
Unfortunately I've not managed to get any info on the kind of sites/pages that were affected or what features they might have had in common so it's hard to say whether we're looking at the impact of a update on google's side or whether it's the links/local changes that are the cause. (Or some combo of the two!)
The good news is that it's been a wake-up call to the client. They now realise that the site in question has some significant weaknesses that need to be addressed and can't/shouldn't just rely on these "unnatural" links from their sister sites!
"Keep calm, don't panic and don't over-react!"
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